content: /*
   * Copyright 2011-2016 David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package ix;
  
  import java.util.*;
  
  import ix.IxZipArray.ZipArrayIterator;
  
  final class IxZipIterable<T, R> extends Ix<R> {
  
      final Iterable<? extends Iterable<? extends T>> sources;
  
      final IxFunction<? super Object[], R> zipper;
  
      IxZipIterable(Iterable<? extends Iterable<? extends T>> sources, IxFunction<? super Object[], R> zipper) {
          this.sources = sources;
          this.zipper = zipper;
      }
  
      @SuppressWarnings("unchecked")
      @Override
      public Iterator<R> iterator() {
  
          Iterable<? extends T>[] src = new Iterable[8];
          int n = 0;
  
          for (Iterable<? extends T> it : sources) {
              if (n == src.length) {
                  src = Arrays.copyOf(src, n + (n >> 1));
              }
              src[n++] = it;
          }
  
          Iterator<T>[] iterators = new Iterator[n];
          for (int i = 0; i < n; i++) {
              iterators[i] = (Iterator<T>)src[i].iterator();
          }
  
          return new ZipArrayIterator<T, R>(iterators, zipper);
      }
  }
  